Star Trek III: The Search for Spock (1984)
Star Trek III: The Search for Spock is the Star Trek film that exists primarily to undo the consequences of the previous Star Trek film. Christopher Lloyd plays the Klingon commander Kruge.
William Shatner played James T Kirk across a television series and seven films, and the delivery, with its unusual emphasis and pauses, became one of the most imitated in television history.
The Wrath of Khan contains his best work in the role, playing a man confronting age and consequence, and the Khan shout is famous enough to be recognised without context.
He has been self-aware about the persona for decades, in Boston Legal and Priceline advertisements, and travelled to space at ninety, describing the experience as overwhelming and sad.